Net Income per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Apr. 29, 2016	Apr. 24, 2015	Apr. 25, 2014
Net income per share:
Net income	$ 229	$ 560	$ 638
Shares used in basic computation	294	316	340
Dilutive impact of employee equity award plans	3	5	7
Dilutive impact of assumed conversion of convertible notes	0	0	1
Shares used in diluted computation	297	321	348
Basic	$ 0.78	$ 1.77	$ 1.87
Diluted	$ 0.77	$ 1.75	$ 1.83